Original feeding device

Abstract

An original feeding device for feeding OHP originals to the display stage of an overhead projector is capable of transportation control suitable for OHP projection. The originals are transported by a conveying film onto the display stage. In order to stop the original at the center of the display stage, after the original is detected by the registration sensor, the conveying film is advanced by an amount equal to the sum of the distance from the registration sensor to the display stage, a half of the length of the display stage and a half of the length of the original.

What is claimed is: PG,36 
     
       1. An original feeding device for consecutively feeding a plurality of originals to a display stage of a projecting apparatus for projecting the image of the original placed on the display stage, comprising: original length detecting means for detecting length of the original;   transport means for consecutively transporting the plurality of originals one by one onto said display stage; and   control means for activating said transport means, after a front end of the original transported by said transport means passes an end portion of said display stage, by an amount corresponding to the sum of one half of the length of said display stage and one half of the length of the original detected by said original length detecting means,   wherein said control means is adapted to control the transportation of the originals in such a manner that the distance from a rear end of an original to a front end of a next original becomes at least equal to a distance, obtained by subtracting one half of the length of the original detected by said original length detecting means from one half of the length of the display stage.   
     
     
       2. An original feeding device according to claim 1, further comprising adjusting means for finely adjusting a stop position of the original on the display stage. 
     
     
       3. An original feeding device according to claim 1, further comprising selecting means for selecting a transporting speed of said transporting means from a plurality of speeds, wherein said transporting means transports the originals at the speed selected by said selecting means. 
     
     
       4. An original feeding device according to claim 1, wherein the originals are transparent sheets. 
     
     
       5. An original feeding device according to claim 1, wherein the projecting apparatus is an overhead projector. 
     
     
       6. An original feeding device for feeding originals to a display stage of a projecting apparatus for projecting the image of the original placed on the display stage, comprising: a first transparent belt wound on a first roller;   a second transparent belt wound on a second roller, said second transparent belt being overlapped with said first transparent belt on the display stage;   stacking means for stacking the originals;   feeding means for feeding the originals on said stacking means one by one to be sandwiched between said first transparent belt and said second transparent belt;   a third roller for winding up said first and second transparent belts as said first transparent belt and said second transparent belt sandwich the originals;   detecting means for detecting a mark provided on one of said first or second transparent belts to indicate a home position of said first and second transparent belts; and   control means for controlling winding by said first and second rollers or winding by said third roller in accordance with a detection result of said detecting means.   
     
     
       7. An original feeding device according to claim 6, further comprising ejecting means for ejecting the originals from between said first and second transparent belts, upon winding by said first and second rollers, to said stacking means. 
     
     
       8. An original feeding device according to claim 6, wherein said control means controls said third roller to wind a first predetermined amount and then controls said first and second rollers to wind a second predetermined amount. 
     
     
       9. An original feeding device according to claim 6, further comprising adjusting means for finely adjusting a stop position of the original on the display stage. 
     
     
       10. An original feeding device according to claim 6, further comprising selecting means for selecting a winding speed of said first and second rollers and said third roller. 
     
     
       11. An original feeding device according to claim 6, wherein the originals are transparent sheets. 
     
     
       12. An original feeding device according to claim 6, wherein the projecting apparatus is an overhead projector.